Both halves confirmed. Haenim was unclickable because the Maple TV next to him had an oversized hit zone that swallowed the click — and underneath that, our list of Maple TVs was nine hand-typed ids covering only the main towns. The original data flags 29 NPCs as Maple TVs, so the Korean Folk Town one was not being treated as a TV at all: no ad, and a full-size talk zone stealing clicks from its neighbour. The list is now read from the game data instead of typed, and the hit zone is sized to the screen rather than the whole cabinet. Leaving IN PROGRESS until you confirm you can click Haenim and that the ad appears on that TV.

Closing this — your v49 run confirmed both halves: you can click Haenim in Korean Folk Town, and that Maple TV shows its ad.